{
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    "rec_id" : 48,
    "depname" : "Tomtor",
    "deptype" : 10,
    "depage" : "660",
    "json" : "{\"id\":\"http:\\/\\/mrdata.usgs.gov\\/carbonatite\\/record\\/48\",\"type\":\"Feature\",\"geometry\":{\"type\":\"Point\",\"coordinates\":[116.57111111111,71.053611111111]},\"properties\":{\"country\":\"Russia\",\"cntrycd\":\"RUSA\",\"stprov\":\"Sakha (Yakutia)\",\"depname\":\"Tomtor\",\"latitude\":\"71.0536111111111\",\"latdeg\":71,\"latmin\":3,\"latsec\":13,\"longitude\":\"116.571111111111\",\"londeg\":116,\"lonmin\":34,\"lonsec\":16,\"startdate\":\"2006 (?)\",\"mintype\":\"beforsite, s\\u00f6vite\",\"deptype\":10,\"niobium\":\"0\",\"ree\":\"0\",\"p2o5\":\"0\",\"grades\":\"Approved resources are unavailable.\",\"depage\":\"660\",\"agemy\":\"660\",\"tectset\":\"Neoproterozoic longitudinal Udgy paleorift between Anabar shield and Olenek uplift\",\"rocks\":\"carbonatite, jacupirangite, nepheline syenite, picrite breccia, urtite\",\"rocksmap\":\"dolomite, sandstone, siltstone (Neoproterozoic)\",\"orebody_fm\":\"central stock, 31.4 sq. km in circular alkaline complex\",\"ore_area\":\"300\",\"alttype\":\"fenitization\",\"altwidth\":\"0\",\"comments\":\"Resources approximately calculated on a base of data from Kogarko and others (1995), Kravchenko and others (1993, 1995), Lapin and Tolstov (1993): Upper oxidized zone (3\\u009625 m thick, ~1.2 sq. km area, 2.24 g\\/cubic cm specific gravity) 40 Mt at ?12% Nb2O5, 11\\u009630% RE2O3. Lower oxidized zone (?300 m thick, ~150 m average, ~9 sq. km area, ~2.5 specific gravity) contains \u003e3,000 Mt resources at 1\\u00961.5%  Nb2O5 and 4\\u00966% RE2O3. Primary carbonatite contains 0.5\\u00960.7% RE2O3 and lower content of niobium. Mined ore contains 9\\u009612% RE2O3 (Naumov, 2008). Deposit is covered by Mesozoic-Cenozoic sediments. Upper oxidized zone (formed at ~400 Ma) occurs under Permian clastic rocks in local paleodepressions above carbonatite stock. Hydrothermal overprint (400\\u0096320 Ma) at 250\\u0096200 \\u00baC.\",\"mineral\":[{\"role\":\"ore\",\"name\":\"apatite\"},{\"role\":\"ore\",\"name\":\"barite\"},{\"role\":\"ore\",\"name\":\"columbite\"},{\"role\":\"ore\",\"name\":\"crandallite\"},{\"role\":\"ore\",\"name\":\"florencite-(ce)\"},{\"role\":\"ore\",\"name\":\"galena\"},{\"role\":\"ore\",\"name\":\"goethite\"},{\"role\":\"ore\",\"name\":\"gorceixite\"},{\"role\":\"ore\",\"name\":\"goyazite\"},{\"role\":\"ore\",\"name\":\"ilmenorutile\"},{\"role\":\"ore\",\"name\":\"limonite\"},{\"role\":\"ore\",\"name\":\"magnetite\"},{\"role\":\"ore\",\"name\":\"monazite-(ce)\"},{\"role\":\"ore\",\"name\":\"pyrite\"},{\"role\":\"ore\",\"name\":\"pyrochlore\"},{\"role\":\"ore\",\"name\":\"rabdophane-(ce)\"},{\"role\":\"ore\",\"name\":\"r\\u00f6ntgenite-(ce)\"},{\"role\":\"ore\",\"name\":\"rutile\"},{\"role\":\"ore\",\"name\":\"sphalerite\"},{\"role\":\"ore\",\"name\":\"sr-pyrochlore\"},{\"role\":\"ore\",\"name\":\"tin\"},{\"role\":\"ore\",\"name\":\"xenotime-(y)\"},{\"role\":\"gangue\",\"name\":\"aegerine\"},{\"role\":\"gangue\",\"name\":\"amphibole\"},{\"role\":\"gangue\",\"name\":\"ankerite\"},{\"role\":\"gangue\",\"name\":\"ba-phlogopite\"},{\"role\":\"gangue\",\"name\":\"calcite\"},{\"role\":\"gangue\",\"name\":\"chlorite\"},{\"role\":\"gangue\",\"name\":\"clinopyroxene\"},{\"role\":\"gangue\",\"name\":\"dolomite\"},{\"role\":\"gangue\",\"name\":\"forsterite\"},{\"role\":\"gangue\",\"name\":\"garnet\"},{\"role\":\"gangue\",\"name\":\"gypsum\"},{\"role\":\"gangue\",\"name\":\"hydromica\"},{\"role\":\"gangue\",\"name\":\"k-feldspar\"},{\"role\":\"gangue\",\"name\":\"kaolinite\"},{\"role\":\"gangue\",\"name\":\"leucite\"},{\"role\":\"gangue\",\"name\":\"phlogopite\"},{\"role\":\"gangue\",\"name\":\"rhodochrosite\"},{\"role\":\"gangue\",\"name\":\"svanbergite\"}],\"reference\":[\"Kogarko, L.N., Kononova, V.A., Orlova, M.P., and Woolley, A.R., 1995, Alkaline rocks and carbonatites of the world, Part 2\\u0097Former USSR: London, Chapman & Hall, 226 p.\",\"Kravchenko, S.M., Belyakov, A.Y., Kubyshev, A.I., and Tolstov, A.V., 1990, Scandium-rare earth-yttrium-niobium ores\\u0097a new economic resource: International Geology Review, v. 32, no. 3, p. 280\\u0096284.\",\"Kravchenko, S.M., Belyakov, A.Y., and Pokrovskiy, B.G., 1993, Geochemistry and origin of the Tomtor massif in the north Siberian platform: Geochemistry International, v. 30, no. 3, p. 20\\u009636.\",\"Kravchenko, S.M., and Pokrovskiy, B.G., 1995, The Tomtor alkaline ultrabasic and related REE-Nb deposits, northern Siberia: Economic Geology, v. 90, p. 676\\u0096689.\",\"Lapin, A.V., and Tolstov, A.V., 1993, A new unique rare metals ore deposit in the carbonatitic crust weathering: Exploration and Protection of Mineral Resources (Razvedka i Okhrana Nedr), no. 3, p. 7\\u009611 (in Russian).\",\"Naumov, A.V., 2008, Review of the world market of rare-earth metals: Russian Journal of Non-Ferrous Metals, v. 49, no. 1, p. 14\\u009622.\"]}}",
    "url" : "https://mrdata.usgs.gov/carbonatite/show-carbonatite.php?rec_id=48"
  }
}